Experimental Investigations and Study of Tribological Behaviour of Alternate WC Coated Bearing Surfaces

Abstract

Coated bearing surfaces exhibit relatively better tribological properties compared with non-coated surfaces irrespective of the coating technology used. An attempt is made to study the effectiveness of alternately coated bearing surfaces with hard material. Striped alternate coated bearing surface with hard material ends up with a bearing surface having alternate bands of soft and hard materials. I the current work Tungsten carbide is taken as hard coating material. A Circular MS (2%-C, 1.65%-Mn, 0.6%-Cu, and 0.6%-Si) disc with alternate WC coating has been developed with plasma spray technique and experiments are designed using full factorial design approach. Tribological properties like wear, coefficient of friction and frictional force were found by conducting number of experiments on both uncoated and coated disks. Pin-on-disk apparatus is used for experimentation. Significant factors were identified and models are developed by using regression analysis. ANOVA is used for analysing results. Experimental results for both the alternate coated and uncoated discs were analysed and correlated.